What is a website for the mortality rate of YY syndrome? Please help

I believe you mean XYY syndrome. Correct me if I am wrong. This is when males, who typically have XY chromosomes, have an additional Y, making it XYY. It is believed that this makes the male more aggressive.

Have you searched here?

Google (http://www.google.com/#sclient=psy&hl=en&q=xyy+syndrome+mortality+rates&aq=f&aqi=&aql=&oq=&pbx=1&bav=on.2,or.r_gc.r_pw.&fp=d8193e5b46b6707)

Yes it is called XYY or YY syndrome. It is the same thing. I has searched Google